Door latch and lock



/ Elm iimunmmniwm I =9 E 17 April 20 1926. 1,581,865

W. S. PETTIT DOOR LATCH AND LOCK Filed May '24, 1924 2 Sheets-Sheet 1 April 20 1926. 1,581,865

w. s. PETTIT DOOR LATCH AND LOCK Filed May 24, 1924 2 Sheets-Sheet 2 NVENTOR 44 1 ATTORN EY 4% I Patented Apr. 20, 1926.

PATENT OFFICE.

WADE SLIIEER IE 'ETTI'I, OF HAMMOND, INDIANA.

. noon LATCH AND Look.

Application filed May 24, 1924. Serial No. 715,679.

To all whom it may concern:

Be it known that I, WADE S. Pnm'r, a citizen of the United States, residin at Hammond, in the county of Lake and tate of Indiana, have invented new and useful Improvements in Door Latches and Locks, of which the following is a specification.

This invention. relates to looks and latches and has for its object the provision of a novel device of this character constituting a radical departure from the ordinary and well known type inasmuch as the latch bolt is carried by the jamb, the keeper and lock mechanism being carried by the door.

An important object is the provision of a device of this character which, on account of the above mentioned feature, may be applied to a door of any size, thickness or the like with the utmost ease and simplicity, the arrangement being furthermore] such that the lock possesses the great advantage of being harder to pick or force than the ordinary variety.

Another object is the provision of novel means connected or associated with the bandles for effecting a positive lock either by means of a key or other equivalent element.

An additional object is the provision of a lock and latch which will be simple to manufacture, inexpensive, easy to install, positive in action, efiicient and durable in service, and a general improvement in the art.

With the above and other objects and ad vantages in view, the invention consists in the combination and arrangement of parts to be hereinafter more fully. described and claimed and illustrated in the accompanying drawings in which:

Figure 1 is an edge view of a door bearing a lock or latch constructed in accordance with my invention.

Figure 2 is a side elevation thereof.

Figure 3 is a side elevation, mostly in section, showing the interior mechanism and also illustrating the latch bolt mounted on the j amb.

Figure 4 is a section on the line 44 of Figure 2.

Figure 5 is a detail cross-section on th line 55 of Figure 4E.

Figure 6 is an elevation of'a fragment of the door out ready for mounting the lock thereon.

F1gure 7 is a detail view similar to Figure 4,. but showing a modification.

Figure 8 is a detail plan view of the handles and yokecarried thereby. Referring more particularly to the drawmgs, the letter A represents a door jamb and a swingable or hinged door cooperatmg therewith. Ordinarily lock keepers are carried by the jamb and the latch bolts or locking bolts by the door, but in carrying out my invention, I follow the reverse order,

the latch bolt 10 being mounted within a housing 11 let into the jamb. The latch bolt is carried by a stem 12 encircled by a 0011 spring 13 which operates to urge the bolt into extended position projecting into the door 0 ening.

The 100 device comprises a casing 14 adapted to be mounted on the door and it 1s necessary that the door he cut away, as shown at 15, to provide a hole 16 for the accommodation of the lock or latch mechanism. The opposite sides of the lock casmg are formed with, or carry, face plates 17 which overlap the cut away portions to make a finished appearance. The edge of the casing has an opening 17 for the reception of the bolt 10 to constitute a keeper. Pivoted at 18 within the casing 14 is a plate 19 formed with a cam projection 20 and having an extension 19 to fit within the opening 17 for forcing the bolt 10 out to release the door. Normally, this keeper swings gravitationally away from the latch bolt so that the bolt 10 will enter the opening and hold the door closed. Journaled through the opposite face plates and passing through the hole/16 is a tubular shaft2l carrying an angular arm 22 terminating in a cam-like end 23 adapted to engage the free or upper end of the keeper 19 and the cam projection 20 thereon for forcing the same into engagement with the latch bolt for forcing the same outwardly to disengage the door and permit opening. In the present instance the arm 22 is carried by a hub 2st surrounding the shaft 21 and secured thereto as by the screw 25 illustrated. Connected with the arm 22 is a retractile coil spring 26 anchored to the casing 14 and operating to hold the arm 22 normally in its uppermost position so that the late 19 will cam notches or recesses 29 for a purposeto be described. Secured to or formed on each end of the tubular shaft 21 is a handle 30 having a bore 31 therein re 'stering with the bore of the tubular sha Rotatable in this bore 31 is a barrel 32 having a key slot 33 and normally held a ainst rotation by spring-pressed pins 34 s idable within sockets 35 in the handle and engaging pigs 36 located within holes in the barrel. 0 ends of the spindles are formed with sockets 37 adapted to receive the end of the key 38 and it will be observed that the key has suitable wards 39 which will enga e the pins 36 and force the spring-presse pins back into the recess is 35 so that the points of engagement of the pins 34 and '36 will coincide with the wall of the bore 31 and permit turning of the key 38 and rotation of the spindle.

Mounted within the tubular shaft 21 are leaf-springs 40 lying within the notches or recesses 29 and carrying opposed outwardly extending terminal pins 41 normally projecting into holes 42 in the tubular shaft 21 and adapted to be projected into holes 43 in one of a pair of stationary sleeves 44 projectin from opposite sides of the lock casing an forming bearings for the tubular shaft. The notches 29 are peculiar in shape so as to define angular or inclined surfaces 44" which are engageable with the pins 41 and which exert a wedging action thereon for forcing them outwardly when the spindle 28 is turned by inserting and rotating either ke a Ordinarily, that is, when the keys are not inserted, both handles and the tubular shaft are rotatable with respect to the spindle and it therefore needs the insertion and manipulation of akey to lock the mechanism. When.

a key is inserted in either handle and turned, the spindle will be turned, whereupon the cam surfaces 44 will force the pins 41 outwardly through the holes 43, thereby lockin the tubular shaft 21 to the sleeve 44.

11 Figures 7 and 8 I have illustrated a modification in which the ke locking means is replaced by slidable latc es 45 mounted against the inner sides of the face plates and having operating buttons 46 movable along slots 47. In this form there is a different type of spindle including a. U-shaped yoke 48 having an extension 49 on its bight portion corresponding to the cam end 23 of the arm 22. On the ends of the arms of this yoke are spindles 5O rotatable within notches 56 in the latches 45 for holding them in either selected position.

From the foregoing description and a study of the drawings, it will be apparent that I have thus provlded a very simply con structed and easilyinstalled lock device which requires no particular skill in its mounting, es ecially as there is so little preliminary wor to be done on the door and its jamb. The device has the great advantage of being very diificult to open or pick from the outside and the lock consequently operates as a grotection against unauthorized entry in a dition to its other advantageous features.

While I have shown and described the preferred embodiments of my invention it is of course to be understood that I reserve the right to make such changes in the form, construction and arrangement of arts as will not depart from the spirit of t e invention or the scope of the Sub oined claims.

I claim:

1. In a door lock and latch device, an outwardly spring-pressed latch bolt mounted in the door jamb, a casing mounted in 'the door and having a keeper opening, a pivoted plate within the casin adapted to be engage against the latch bolt for forcing the latter out of said opening, a spindle extending through the door and easing, a hollow shaft rotatable on the spindle, an arm on the hollow shaft adapted to engage and swing the keeper into operative position, handles stationarily mounted on the hollow shaft, and key operated means within the handles for locking the hollow shaft against rotation.

2. In a door lock and latch device, an outwardly spring-pressed latch bolt mounted in the door jamb, a casing mounted in the door and having a keeper 0 ening, a pivoted plate within the casing a apted to be engaged .against the latch bolt and to close said open- 3. In adoor look and latch device, an outwardly spring pressed latch bolt mounted :in the door jamb, a casing mounted in the door-and having a keeper opening, a. pivoted plate within the casing ada ted to be engaged against the latch bolt or forcing the latter outof said opening, a spindle extending through the door and casing and rojecting beyond both sides thereof, a be low 10 shaft rotatable on the spindle, an arm on the hollow shaft adapted "to engage and swing the kee r into'o rative posltion, handles on the ollow-sha the spindle being provided with radial shoulders and inclined surfaces leadin thereto and pins slidabl 15 WADE SLIFER PETTIT. 

